I'm Solid Snake, BIOTCH!!!
I've been looking over some material by Motosada Mori who is best known as the military advisor for the Metal Gear Solid series. Snake's CQC is Mori's combatives program. Its mainly a mix of Judo/Jujutsu and Aikido. Some of the stuff just doesn't work for me but the surprising thing was that the disarms and weapon retention have worked fine. I decided to try some during MOUT training since I'm usually the guy that goes down fighting to be hogtied and searched I'd give them a go. I have used some of the rifle disarms and even managed to escape a few times (most of the time I will get the weapon an pop off a few rounds then get blasted) It been intresting so far but not something I'd recommend for anyone who isn't already versed in Judo.
I haven't tried any of his gun and knife work (as seen in the games) but will just because.